public class one {
    public int add(int a,int b){
        return a + b;
    }

    //减法功能
    public int sub(int a,int b){
        return a - b;
    }

    //乘法功能
    public int mul(int a,int b){
        return a * b;
    }

    //除法功能
    public int div(int a,int b){
        return a / b;
    }
}

